During the Sontaran invasion of Earth in 2008, Colonel Mace called in the Valiant, which was referred to by the call-sign "Hawk Major". The ship's powerful turbines were used to clear the Sontarans' poisonous fog-like gas from the ATMOS factory and the energy weapon was used to blast apart the factory, killing many Sontarans. (TV: The Poison Sky)

At some point following the Dalek invasion, the Valiant was apparently salvaged and repaired, or replaced by another ship with the same name. The Twelfth Doctor asked whether he was being taken to the Valiant (mistakenly referring to the craft as "Cloudbase") during the Missy-initiated Cyberman attack on Earth, but Kate Stewart told him that doing so would be too obvious and too easy of a target. He was instead taken to an aircraft designated as Boat One. Osgood incorrectly stated Cloudbase as being from Thunderbirds, but she was corrected by ColonelAhmed who noted it was from Captain Scarlet, with the Doctor revealing that he had met Sylvia Anderson. (TV: Death in Heaven)

According to non-narrative information in DWBIT 59, when the Earth was moved to the Medusa Cascade the Valiant took heavy damage from the Daleks. When it was forced over heavily populated areas, the decision was taken to land on empty farmland, avoiding a further loss of life. However, the attack still continued.